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not getting enough back pressure in the exhaust system. weak or lose of power can be caused by this. usually middle box. if you hit it and it rattles thats were your problem is. also can be piston rings falling under pressure.

what cc is the engine. what color is the smoke.... gray is water and normal. white over water in the exhaust usually means you been parking on a hill with the back of the the car facing the top of the hill. it water logs the cat in the exhaust. takes a long time to get the water out so you need a long run to do this. black smoke head problems could be the egr or the head gasket....

If you have just a bit more of smoke than usual do a code scanning to check if mixture is rich or lean or if there is misfire or other problem that can affect the engine.

Dark thick smoke is symptom of unburned fuel or oil getting into the cylinder. The smoke can be the result of rich mixture, piston ring problems, valve problems, ring problems or misfire. EGR and PCV system problems also result in smoke from exhaust.

If smoke is only at start and it is dark gray it is probably because of incorrect mixture resulting from another problem.

If problem is piston rings or valves the smoke will be black, thick and smelly because oil gets burned in cylinders. The smoke in this case is not only at start.

Check if you have spark in all cylinders.

Check if one or more of the spark plugs is dirtier than the others. That will tell you if problem is with that (or those) cylinders only.

Do a DTC code scanning using an OBDII reader. In US the code can be done for free at Autozone.

Thick white smoke is instead symptom of water (or coolant) getting into the cylinder. Check if the coolant fluid level is going down by itself. Look for traces of fuel in coolant reservoir. Do a compression test to find out if there is head gasket leakage inside the engine.

IS THE CHECK ENGINE LIGHT ON.IF YES COULD BE FAULTY PCM.BUT HAVE CAR CODE SCAN TO MAKE SURE BECAUSE YOU COULD HAVE A FUEL SOAK CHARCOAL CANISTER , WEAK IGNITION SPARK, FAULTY FUEL PRESSURE REGULATOR.AND LOW CYLINDER COMPRESSION ALL OF THESE THINGS WILL CAUSE BLACK RICH SMOKE MIXTURE.

when the car is running do you have blue smoke from the exhaust? :If so then the piston rings are fried. If not then do you have oil on the motor around the valve covers? If so then the valve cover gaskets needs replacement.

There in only 1 thing i can think of where the white smoke is from it could be anitfreeze if so it would mean a cracked head or a bad head gasket if it gets worse then you have a big problem but if you check the water level and it looks fine then you should be ok for a while